I've been asked variations of this question a few times recently, as I'm studying value drift for my undergraduate thesis, so I thought I would seek out others' thoughts on this.
I suppose part of this depends on how we define value drift. I've seen value drift defined as broadly as changes in values (from the Global Optimum podcast) and as narrowly as becoming less motivated to do altruistic things over time (from Joey Savoie's forum post). While the latter seems almost certainly net-negative, how the former plays out is a little less clear to me.
This leads me to wonder if there might be different kinds of value drift that may be varying degrees of good or bad.